(a_{1}=2, d=13), calculate (s_{20}). The first term and the constant difference is given for an arithmetic sequence....

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\(a_{1}=2, d=13\), calculate \(s_{20}\).

The first term and the constant difference is given for an arithmetic sequence. Use that information to find the sum of the first \(n\) terms of the sequence, \(s_{n}\).

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